GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Uplander Ext. 🢒 Seats 🢒 Power Seats 🢒 Sit-N-Lift Mobility Seat Does Not Enter Diagnostic Mode

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Right Rear Door Open Switch Signal

1

1

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1. Sit-n-lift seat module will not enter diagnostic mode

Circuit/System Description

The sit-n-lift seat module monitors the door ajar switch signal circuit to determine when to enter and exit diagnostic mode. To enter or exit diagnostic mode, the right rear sliding door ajar switch must be pressed 5 times within 4 seconds.

Reference Information

Schematic Reference

Rear Seat Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Sit-N-Lift Mobility Seat Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Verification
  1. Ignition ON, verify the door ajar indicator turns ON and OFF while opening and closing the right rear sliding door.
    2. ⇒If the door ajar indicator does not operate as specified, refer to Door Ajar Indicator Malfunction .
  2. Open the right rear sliding door. Press the door ajar switch 5 times within 4 seconds. Verify the sit-n-lift seat module enters diagnostic mode.

Circuit/System Testing
  1. Ignition OFF, disconnect the X1 harness connector at the sit-n-lift seat module.
  2. Right rear sliding door closed, test for infinite resistance between the signal circuit terminal 12 and ground.
    3. ⇒If less than the specified value, test the signal circuit for a short to ground.
  3. Right rear sliding door open, test for less than 10 ohms between the signal circuit terminal 12 and ground.
    4. ⇒If greater than the specified range, test the signal circuit for a short to ground.
  4. If all circuits test normal, replace the sit-n-lift seat module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for sit-n-lift seat module replacement, programming, and setup